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<br />002436 <br /> <br />(G. W.Leavesley, oral commun~, 1975), These results will be integrated into <br />both the flow-routing and reservoir-assessment elements. <br /> <br />Minimwrz-fZow anaZyais.--A low-flow analysis will be made for the basin <br />using the Log-Pearson Type III frequency analysis. Low-flow characteristics <br />will be computed for 7-, 10-, and 30-day minimum mean flow periods at 2-, 10-, <br />and 20-year recurrence intervals. As noted by Livingston (1970) and Wah'l <br />(1970), minimum-flow analysis in Colorado and Wyoming is quite complicated <br />because of surfa'ce-water diversions, topography, geography, and cl imate, In <br />the Yampa-River basin, diversion of water is quite prevalent, affecting ma'ny <br />daily streamflow records. <br /> <br />For the minimum-flow analysis, the water-d"lvers ion data, described ear- <br />lier, will be.used with the existing surface-water records to reconstruct <br />estimated natural flows at the various surface-water sites, These data then <br />will be used in the minimum-flow analysis.. D. R. Tuthill, Jr;,while a grad- <br />uate student in civil engineering at the University of Colorado, assisted the <br />project staff In this assessment-analysis component, and his findings are pre- <br />sented in his masterts thesis (Tuthill, 1975), <br /> <br />Time-of~tT'aveZ studies,--One or two time-of-travel studies are planned <br />for the Yampa River mainstem from, Steamboat Springs to Craig, Colo., and the <br />Little Snake River malnstem from Slater to Baggs, Wyo, The time-of-travel <br />studies will be made during the spring high-flow and summer low..,flow periods <br />of 1976. Field measurements will be made at these two different discharge <br />conditions and an approximate time-of-travel versus discharge relationship <br />wi 11 be developed for the study reach (Bauer, 1968), These studies wi 11 en- <br />able a moreeritical analysis to be made on hydraul ic-flow conditions as a <br />basis for evaluating the waste-assimilative capacity of the upper'Vampa River <br />mainstem. <br /> <br />The time-of-.travel studies will be made by the dye-tracer technique <br />'(Wilson, 1968).'"The dye "cloud" will be analyzed for longitudinal dispersion <br />and peak concen.trationdecay. <br /> <br />GroundWater <br /> <br />The primary use of ground water in ,the Yampa River 'basin has been for do..; <br />'mestic, livestock, and municipal ,suppl ies.Wells princi.pally have been dri 11- <br />-edln unconfined ,alluvial aquf'fers that generally followst'ream-cut valleys. <br />""Mostwells:are'less than 100 feet OOm) deep, but a few have penetrated:deep- <br />, e-r iaqu lfers. <br /> <br />Results cif .two ongoing ground-water reconnaissance investigations by the <br />U.S. .:Geological'Survey in cooperation with the Colorado Division of Water Re- <br />"sources, Office:of ,the State Engineer, and the U,S. Environmental Protection <br />Agency will p'rovi.de supplemental information, A few of the inventoried wells <br />may be designated:as monitoring sites for periodic observations of water lev- <br />els :and selected water-qual itymeasurements, In addition, several deep wells <br />presently arebei'ng drilled in ,.the northeastern part of t.he basin in Wyoming <br />as part ofa Hthological study by ,the Geological Survey, Once completed, <br />some .of these wells .will :bemaJntaine.das observation wells for water levels. <br /> <br />18 <br /> <br />" <br /> <br />~ d <br />